Factors that influence muscle shear modulus during passive stretch

Koo, Terry K. and Hug, Francois (2015) Factors that influence muscle shear modulus during passive stretch. Journal of Biomechanics, 48 12: 3539-3542. doi:10.1016/j.jbiomech.2015.05.038

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Author Koo, Terry K.
Hug, Francois
Title Factors that influence muscle shear modulus during passive stretch
Journal name Journal of Biomechanics   Check publisher's open access policy
ISSN 1873-2380
0021-9290
Publication date 2015-06-12
Sub-type Article (original research)
DOI 10.1016/j.jbiomech.2015.05.038
Open Access Status File (Author Post-print)
Volume 48
Issue 12
Start page 3539
End page 3542
Total pages 4
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2016
Language eng
Abstract Although elastography has been increasingly used for evaluating muscle shear modulus associated with age, sex, musculoskeletal, and neurological conditions, its physiological meaning is largely unknown. This knowledge gap may hinder data interpretation, limiting the potential of using elastography to gain insights into muscle biomechanics in health and disease. We derived a mathematical model from a widely-accepted Hill-type passive force–length relationship to gain insight about the physiological meaning of resting shear modulus of skeletal muscles under passive stretching, and validated the model by comparing against the ex-vivo animal data reported in our recent work (Koo et al. 2013). The model suggested that resting shear modulus of a slack muscle is a function of specific tension and parameters that govern the normalized passive muscle force–length relationship as well as the degree of muscle anisotropy. The model also suggested that although the slope of the linear shear modulus–passive force relationship is primarily related to muscle anatomical cross-sectional area (i.e. the smaller the muscle cross-sectional area, the more the increase in shear modulus to result in the same passive muscle force), it is also governed by the normalized passive muscle force–length relationship and the degree of muscle anisotropy. Taken together, although muscle shear modulus under passive stretching has a strong linear relationship with passive muscle force, its actual value appears to be affected by muscle’s mechanical, material, and architectural properties. This should be taken into consideration when interpreting the muscle shear modulus values.
Keyword Supersonic Shear Imaging
Elastography
Passive muscle force
Shear modulus
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Health and Rehabilitation Sciences Publications
 
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